[standalone@localhost:9990 /] /subsystem=modcluster/:read-operation-description(name=stop
{
    "outcome" => "success",
    "result" => {
        "operation-name" => "stop",
        "description" => "Tell reverse proxies that all contexts on the node can't process requests.",
        "request-properties" => {"waittime" => {
            "type" => INT,
            "description" => "Timeout to wait for all contexts to stop.",
            "expressions-allowed" => false,
            "required" => false,
            "nillable" => true,
            "default" => 10,
            "unit" => "SECONDS"
        }},
        "reply-properties" => {},
        "read-only" => false,
        "runtime-only" => true
    }
}

 Stopping a context with waittime set to 0, meaning no timeout, instructs the balancer to stop routing any request to it immediately, which forces failover to another available context.

If you set a timeout value using the waittime argument, no new sessions are created on this context, but existing sessions will continue to be directed to this node until they complete or the specified timeout has elapsed. The waittime argument defaults to 10 seconds.